2) Uncheck the box next to "Enable Steam Community In-Game" and click OK.

(If you would prefer to only disable this for Orcs Must Die! then right-clicking on Orcs Must Die!, click "Properties" and uncheck "Enable Steam Community In-Game" in the "General" tab.)

Turn Off Additional Monitors

Orcs Must Die! doesn’t play well with multiple monitors. Turning off additional displays helps. Even if you have one monitor, it is worth double-checking your settings as occasionally windows will detect additional devices and load them as a display.

Windows 7 directions

1) Navigate to your Screen Resolution settings using the following path: Control Panel\Appearance and Personalization\Display\Screen Resolutions

2 ) Select the drop-down menu under “Multiple Displays” and choose “Show Desktop only on 1”

Reset your resolution settings

Sometimes it's possible to save an invalid resolution in-game. You can modify your config files to fix this using the instructions here.